在微信上突然看到“XXX撤回一条消息”的时候，心里痒不痒？现在就教你如何实现消息防撤回的功能。不限手机型号、手机无需root，只要微信号可以登上网页版就可以了（部分不常用和新申请的账号会登不上网页版）。

环境

Centos7
python2.7
itchat

代码

# coding:utf-8
import itchat
from itchat.content import TEXT
from itchat.content import *
import sys
import time
import rereload(sys)
sys.setdefaultencoding('utf8')
import osmsg_information = {}
face_bug = None  # 针对表情包的内容@itchat.msg_register([TEXT, PICTURE, FRIENDS, CARD, MAP, SHARING, RECORDING, ATTACHMENT, VIDEO], isFriendChat=True,isMpChat=True)
def handle_receive_msg(msg):global face_bugmsg_time_rec = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())  # 接受消息的时间msg_from = itchat.search_friends(userName=msg['FromUserName'])['NickName']  # 在好友列表中查询发送信息的好友昵称msg_time = msg['CreateTime']  # 信息发送的时间msg_id = msg['MsgId']  # 每条信息的idmsg_content = None  # 储存信息的内容msg_share_url = None  # 储存分享的链接，比如分享的文章和音乐print msg['Type']print msg['MsgId']if msg['Type'] == 'Text' or msg['Type'] == 'Friends':  # 如果发送的消息是文本或者好友推荐msg_content = msg['Text']print msg_content# 如果发送的消息是附件、视屏、图片、语音elif msg['Type'] == "Attachment" or msg['Type'] == "Video" \or msg['Type'] == 'Picture' \or msg['Type'] == 'Recording':msg_content = msg['FileName']  # 内容就是他们的文件名msg['Text'](str(msg_content))  # 下载文件# print msg_contentelif msg['Type'] == 'Card':  # 如果消息是推荐的名片msg_content = msg['RecommendInfo']['NickName'] + '的名片'  # 内容就是推荐人的昵称和性别if msg['RecommendInfo']['Sex'] == 1:msg_content += '性别为男'else:msg_content += '性别为女'print msg_contentelif msg['Type'] == 'Map':  # 如果消息为分享的位置信息x, y, location = re.search("<location x=\"(.*?)\" y=\"(.*?)\".*label=\"(.*?)\".*", msg['OriContent']).group(1, 2, 3)if location is None:msg_content = r"纬度->" + x.__str__() + " 经度->" + y.__str__()  # 内容为详细的地址else:msg_content = r"" + locationelif msg['Type'] == 'Sharing':  # 如果消息为分享的音乐或者文章，详细的内容为文章的标题或者是分享的名字msg_content = msg['Text']msg_share_url = msg['Url']  # 记录分享的urlprint msg_share_urlface_bug = msg_content##将信息存储在字典中，每一个msg_id对应一条信息msg_information.update({msg_id: {"msg_from": msg_from, "msg_time": msg_time, "msg_time_rec": msg_time_rec,"msg_type": msg["Type"],"msg_content": msg_content, "msg_share_url": msg_share_url}})##这个是用于监听是否有friend消息撤回
@itchat.msg_register(NOTE, isFriendChat=True, isGroupChat=True, isMpChat=True)
def information(msg):# 这里如果这里的msg['Content']中包含消息撤回和id，就执行下面的语句if '撤回了一条消息' in msg['Content']:old_msg_id = re.search("\<msgid\>(.*?)\<\/msgid\>", msg['Content']).group(1)  # 在返回的content查找撤回的消息的idold_msg = msg_information.get(old_msg_id)  # 得到消息print old_msgif len(old_msg_id) < 11:  # 如果发送的是表情包itchat.send_file(face_bug, toUserName='filehelper')else:  # 发送撤回的提示给文件助手msg_body = "【" \+ old_msg.get('msg_from') + " 撤回了 】\n" \+ old_msg.get("msg_type") + " 消息：" + "\n" \+ old_msg.get('msg_time_rec') + "\n" \+ r"" + old_msg.get('msg_content')# 如果是分享的文件被撤回了，那么就将分享的url加在msg_body中发送给文件助手if old_msg['msg_type'] == "Sharing":msg_body += "\n就是这个链接 " + old_msg.get('msg_share_url')# 将撤回消息发送到文件助手itchat.send_msg(msg_body, toUserName='filehelper')# 有文件的话也要将文件发送回去if old_msg["msg_type"] == "Picture" \or old_msg["msg_type"] == "Recording" \or old_msg["msg_type"] == "Video" \or old_msg["msg_type"] == "Attachment":file = '@fil@%s' % (old_msg['msg_content'])itchat.send(msg=file, toUserName='filehelper')os.remove(old_msg['msg_content'])# 删除字典旧消息msg_information.pop(old_msg_id)@itchat.msg_register([TEXT, PICTURE, FRIENDS, CARD, MAP, SHARING, RECORDING, ATTACHMENT, VIDEO], isGroupChat=True)
def handle_receive_msg(msg):global face_bugmsg_time_rec = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())  # 接受消息的时间# groupid = msg['FromUserName']# chatroom = itchat.search_chatrooms(userName=groupid)msg_Actual_from = msg['ActualNickName']# msg_Actual_from = msg['User']# msg_from = msg_Actual_from['Self']['NickName']msg_from = msg_Actual_frommsg_time = msg['CreateTime']  # 信息发送的时间msg_id = msg['MsgId']  # 每条信息的idmsg_content = None  # 储存信息的内容msg_share_url = None  # 储存分享的链接，比如分享的文章和音乐print msg['Type']print msg['MsgId']if msg['Type'] == 'Text' or msg['Type'] == 'Friends':  # 如果发送的消息是文本或者好友推荐msg_content = msg['Text']print msg_content# 如果发送的消息是附件、视屏、图片、语音elif msg['Type'] == "Attachment" or msg['Type'] == "Video" \or msg['Type'] == 'Picture' \or msg['Type'] == 'Recording':msg_content = msg['FileName']  # 内容就是他们的文件名msg['Text'](str(msg_content))  # 下载文件# print msg_contentelif msg['Type'] == 'Card':  # 如果消息是推荐的名片msg_content = msg['RecommendInfo']['NickName'] + '的名片'  # 内容就是推荐人的昵称和性别if msg['RecommendInfo']['Sex'] == 1:msg_content += '性别为男'else:msg_content += '性别为女'print msg_contentelif msg['Type'] == 'Map':  # 如果消息为分享的位置信息x, y, location = re.search("<location x=\"(.*?)\" y=\"(.*?)\".*label=\"(.*?)\".*", msg['OriContent']).group(1, 2, 3)if location is None:msg_content = r"纬度->" + x.__str__() + " 经度->" + y.__str__()  # 内容为详细的地址else:msg_content = r"" + locationelif msg['Type'] == 'Sharing':  # 如果消息为分享的音乐或者文章，详细的内容为文章的标题或者是分享的名字msg_content = msg['Text']msg_share_url = msg['Url']  # 记录分享的urlprint msg_share_urlface_bug = msg_content##将信息存储在字典中，每一个msg_id对应一条信息msg_information.update({msg_id: {"msg_from": msg_from, "msg_time": msg_time, "msg_time_rec": msg_time_rec,"msg_type": msg["Type"],"msg_content": msg_content, "msg_share_url": msg_share_url}})##这个是用于监听是否有Group消息撤回
@itchat.msg_register(NOTE, isGroupChat=True, isMpChat=True)
def information(msg):# 这里如果这里的msg['Content']中包含消息撤回和id，就执行下面的语句if '撤回了一条消息' in msg['Content']:old_msg_id = re.search("\<msgid\>(.*?)\<\/msgid\>", msg['Content']).group(1)  # 在返回的content查找撤回的消息的idold_msg = msg_information.get(old_msg_id)  # 得到消息print old_msgif len(old_msg_id) < 11:  # 如果发送的是表情包itchat.send_file(face_bug, toUserName='filehelper')else:  # 发送撤回的提示给文件助手msg_body = "【" \+ old_msg.get('msg_from') + " 群消息撤回提醒】\n" \+ " 撤回了 " + old_msg.get("msg_type") + " 消息：" + "\n" \+ old_msg.get('msg_time_rec') + "\n" \+ r"" + old_msg.get('msg_content')# 如果是分享的文件被撤回了，那么就将分享的url加在msg_body中发送给文件助手if old_msg['msg_type'] == "Sharing":msg_body += "\n就是这个链接 " + old_msg.get('msg_share_url')# 将撤回消息发送到文件助手itchat.send_msg(msg_body, toUserName='filehelper')# 有文件的话也要将文件发送回去if old_msg["msg_type"] == "Picture" \or old_msg["msg_type"] == "Recording" \or old_msg["msg_type"] == "Video" \or old_msg["msg_type"] == "Attachment":file = '@fil@%s' % (old_msg['msg_content'])itchat.send(msg=file, toUserName='filehelper')os.remove(old_msg['msg_content'])# 删除字典旧消息msg_information.pop(old_msg_id)# Main (enableCmdQr = True 时，将会生成二维码图片，如 =2 时二维码乱码的话 改为1 即可
itchat.auto_login(enableCmdQR=2, hotReload=True)
itchat.run()

代码来源：知乎用户 shanewa

如果想看懂代码的话，在有python一点基础的前提下搞懂 Python 中的 装饰器 概念。下面是用到itchat中主要的一段代码

def msg_register(self, msgType, isFriendChat=False, isGroupChat=False, isMpChat=False):''' a decorator constructorreturn a specific decorator based on information given '''if not (isinstance(msgType, list) or isinstance(msgType, tuple)):msgType = [msgType]def _msg_register(fn):for _msgType in msgType:if isFriendChat:self.functionDict['FriendChat'][_msgType] = fnif isGroupChat:self.functionDict['GroupChat'][_msgType] = fnif isMpChat:self.functionDict['MpChat'][_msgType] = fnif not any((isFriendChat, isGroupChat, isMpChat)):self.functionDict['FriendChat'][_msgType] = fnreturn fnreturn _msg_register

运行

1.连接云服务器，安装pip

2.使用pip 安装 itchat库 （一个利用微信网页版api接口写的，有兴趣的话可以鼓捣鼓捣）

3.将脚本文件上传到云服务器

4.运行代码
1）扫码登录

2）登录成功

结束

可能好多人会说，我没有服务器，该怎么办！其实我放在服务器上是为了二十四小时都在运行，这样可以一直都在防撤回状态了。如果你也想这么做的话就参考下面这篇文章

来，教你们如何“薅羊毛”

可以“薅”好几台服务器。不过也可以先在自己电脑上试一试。